Here is an example of the revered Asahi Pentax SV. Mechanical shutter, no light meter to fail and no need for any hard to find batteries. With a max shutter speed of 1/1000 and a wide range of M42 screw mount lenses to choose from this is a very versatile, robust system. Provided you have plenty of film with you an extended back blocks hike will not cause the SV, or the photographer, any stress. Very hard to find in this near mint condition and highly recommended for the enthusiast collector.